{
{   The purpose of this request is to position a form to a new screen location.
{ This allows you to define a form at one location and then to display it at
{ another location or to move a form from its currently displayed location to
{ another location that is more convenient for the terminal user.  If you
{ issue this request before the form is displayed, then the form will be
{ displayed at the specified location.  If you issue this request when the
{ form is displayed, the form will be deleted from its current location and
{ added at the new location.  The next request that updates the screen,
{ fdp$xread_forms or fdp$xshow_forms, will replot the screen for the terminal
{ user.  Any forms uncovered by the deleted form will be replotted.  The added
{ form lies on top of other forms occupying the same area on the screen.  You
{ cannot position a pushed form.
{
{       FDP$XPOSITION_FORM (FORM_IDENTIFIER, SCREEN_X_POSITION,
{         SCREEN_Y_POSITION, STATUS)
{
{ FORM_IDENTIFIER: (input)  This parameter specifies the form to position.
{
{ SCREEN_X_POSITION: (input)  This parameter specifies the x position of the
{       form on the screen.  The first x position is the first character of
{       the top line of the screen.  The first x position is numbered 1.  The
{       x position increases by 1 for each character position on the screen
{       from left to right.
{
{ SCREEN_Y_POSITION: (input)  The parameter specifies the y position of the
{       form with respect to the screen.  The first screen y position is the
{       first character on the top line of the screen.  The first y position
{       is numbered 1.  The y position increases by one for each line of the
{       form going from top to bottom.
{
{ STATUS: (output) This parameter specifies the integer variable to set to
{       indicate the results of the request.
{
{       condition identifiers: fde$bad_data_value
{                              fde$form_already_added
{                              fde$form_pushed
{                              fde$form_not_scheduled
{                              fde$form_too_large_for_screen
{                              fde$invalid_form_identifier
{                              fde$no_space_available
{                              fde$system_error
{
